B{sub 4}C-SiC reaction-sintered coatings on graphite plasma facing components

Technical Report · Sun May 01 00:00:00 EDT 1994

OSTI ID:10183528

Valentine, P G; Trester, P W ^[1]; Winter, J ^[2]

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1. General Atomics, San Diego, CA (United States)
2. Kernforschungsanlage Juelich GmbH (Germany); and others

Boron carbide plus silicon carbide (B{sub 4}C-SiC) reaction-sintered coatings for use on graphite plasma-facing components were developed. Such coatings are of interest in TEXTOR tokamak limiter-plasma interactions as a means of reducing carbon erosion, of providing a preferred release of boron for oxygen gettering, and of investigating silicon`s effect on radiative edge phenomena. Specimens evaluated had (a) either Ringsdorfwerke EK 98 graphite or Le Carbon Lorraine felt-type AEROLOR A05 CFC substrates; (b) multiphase coatings, comprised of B{sub 4}C, Sic, and graphite; (c) nominal coating compositions of 69 wt.-% B{sub 4}C + 31 wt.-% SiC; and (d) nominal coating thicknesses between 250 and 775 {mu}m. Coated coupons were evaluated by high heat flux experiments in the JUDITH (electron beam) test facility at KFA. Simulated disruptions, with energy densities up to 10 MJm{sup {minus}2}, and normal operation simulations, with power densities up to 12 MWm{sup {minus}2}, were conducted. The coatings remained adherent; at the highest levels tested, minor changes occurred, including localized remelting, modification of the crystallographic phases, occasional microcracking, and erosion.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 10183528
• Report Number(s): GA-A-21719; CONF-940580-19; ON: DE94019105; BR: 35AT10020/35KC07000; TRN: 94:020168
• Resource Relation: Conference: 11. international conference on plasma surface interactions in controlled fusion devices,Mito (Japan),23-27 May 1994; Other Information: PBD: May 1994
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
36 MATERIALS SCIENCE
BORON CARBIDES
EROSION
MICROSTRUCTURE
FABRICATION
SILICON CARBIDES
PROTECTIVE COATINGS
GRAPHITE
COMPOSITE MATERIALS
THERMONUCLEAR REACTOR MATERIALS
TEXTOR TOKAMAK
ADHESION
CARBON FIBERS
SINTERING
ELECTRON BEAM MELTING
EXPERIMENTAL DATA
PERFORMANCE TESTING
700480
360201
360202
360205
360604
COMPONENT DEVELOPMENT
MATERIALS STUDIES
PREPARATION AND FABRICATION
STRUCTURE AND PHASE STUDIES
CORROSION AND EROSION
CORROSION, EROSION, AND DEGRADATION